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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee041b41d0792704cbc72abf7b8f5eddffea3b3b890f8fa43fe08648cb14e318' 
  AND token = 'LHIAGWqCw7nC06+mjBtIfwnLaL+UNCDC2bfJRa8DklQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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