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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920542ab5b2fbb5380fd85ae66189c3232fb8f2715a98806c93a3fdffaad8fd1' 
  AND token = '513nlgAcTgJr/EZn5qva04H1IFA795u7j82cLI9y4YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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