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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4e40acda10eb6d4eb44c047e32d269104c33556e85ae4cb41a751410879c01' 
  AND token = 'QaSVdeufCV8XG8w9AEeuFVhELaUyWNjhJj6sofzY91s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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