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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca772e2161192e80dd0ce76b074e2d51c61c072733b462498ef3190b7f88246' 
  AND token = 'g9Vb6B1mck3PQN+6jrQHXCdJgYAxeOjtvwQfCYflQyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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