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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114ae36141a8a68d7c1d22cf082997a905c3e41b90c9ac4dc0fc10ac9a87e9cf' 
  AND token = 'zvpUm3xKjpqpcWbcLpQRWZMOpDmwhJf2PDG/nRSe52I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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