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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fa50d72e28f2abd7ab6ad5f86ba54062793fd107db5ead9eb2f06acaa6f82c' 
  AND token = '4POuf6tMDt2p6uERBMWikJ+HEKd9Z8MAwrx4IalURpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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