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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f124ff3e9d20a2bdf76a489bb9a40382143221c4dfdee9e1278def3421488a1f' 
  AND token = 'cF1jNimYnAC4JLOzoUwPaZrgf7N1yN7r3n0Se3+xMVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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