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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2575d5d0e7b9fc9aa299a52850a78fe8a54e0774474e67065088b3c727f9c65b' 
  AND token = '1Ph91/LpiHQBigqMPS9b1ndj4azs5Gr7qOI0xJvuH4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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