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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5baa63aeaba7cf6df57346c5a31557450cfe68f40ed3df4594dbb45621e8030' 
  AND token = '7P/VdfRhz06VfU/T1bDH2nftQ5YxgQhbqv6pFu5wR/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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