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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa66bef1114f7d15d417d7c6af9f3774a0bea17e9b7a5047ded9ae6fc0f596fd' 
  AND token = 'OBeG/H9mYYU+jJ6Eawd3JNuy+iCfeG0+Ksb2MUyjU94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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