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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718f2d6bf7c3728afcd7c655dadbd04ba799d5af7672c6126ba76122499880b1' 
  AND token = 'D8QDNqXgm99iAl72sGe7xjpDh2V6crhnz8EaehhTNyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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