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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970b3ed6fdf974eb1f1ceb33c9d15b53be6c4b5cda3c9fc46981d971ed89eb60' 
  AND token = 'JPNxKrLXwURuUuTvFXGD9T45avUd3Wxq5CTxjyBl83g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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