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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744ca71c0416943e118bd6ce4468d25acdfbc84267d4966e1e023a03b20a37f3' 
  AND token = '7Co+KwtmTJ09IdkrpzlcZdN+5YF0PPsH1LtQaa/c/z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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