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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8004826768a08b754975874922b5b8adf0dbd6b99dc878335d898745a11b907c' 
  AND token = 'I8SP54Voyfw5kttYV4rp9tYhgfnK2H+OWE+TOKu6mD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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