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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f00ebb22843f91385646f5d3243a03d3828fb86f93d3a08b41cf284b333daf' 
  AND token = 'BZBv0TSOscNUZG6YXKHFOIqXRtCorLtdDAACp8mNeu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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