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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc09050df075d01b2b12fc218f406c79f2b9f14054c03344407cd521290bfdf0' 
  AND token = '8Rx0r3j1wQYpwxFnfSnn0AUGC6jHK/BZjkSJWipYKgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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