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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e2c211cc96319bde713f8e8c4c293398a39d2d6c1419f7df461e8f5c1d54c4' 
  AND token = 'RSpa9SyFfhtvxUasj2gYla5A5cUBS1lLHdt4V+8eW8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}