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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45a69a8b8f5c1faf729e2a290b713fb4ba5e5a1dcf0b5f47704c7cea79ec378' 
  AND token = 'YrZkS0D5R3TrXc9AQSauxikXmvmpyw77kTR8ZPISrq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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