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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e45b580f5dd2ef0850bda1337ced247e42aea36862fc5eecc33f94c7e7d77e' 
  AND token = 'm3T+6fuxyCqOm60YV2gDqlHQ6uhgneucF80FSqz9YrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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