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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bed3bba612ee75deecf1ab6db9c121c6985fb3fa36518cc20167d8b280e18b' 
  AND token = 'rfsdir21izPafEA07iQzndaX4Fhya5/HHBtZl34v7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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