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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825573deb90c6f7e638927ee4fd2e5863d1cee89e2a9ed2c816e372c7e727b46' 
  AND token = 'wkv/rTTZuassJacLIeOmORcAbV1TcNBC9ILELwa/T6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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