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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026a56b2e80f45e854a82276706776bd00306afb9d0af2b6c037389b2d9cbb6d' 
  AND token = 'S7qD+eG8ez70jBJhsx/G7/96YwzCD7B/oFfqEsixPPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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