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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7f3c63474c06bd48d6707440e41b3b77af530bfe7266ae4ed053e8b3b3656b' 
  AND token = 'poQjkLapIYLi5QZB96vBOk4idYafBPLvs6/OmXYQXb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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