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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcc7d514c16b8ab7ab3bcb4c56efdacdd36ce749b3e4da512690e05a0743a3e' 
  AND token = 'oIddsz9zXAIrZNVybqpTSMow2MPZjzJjFbiGuj4KW0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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