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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6877e5694bf70638ac618754a261572462d571c5103026b69bc8d46b77e9789f' 
  AND token = '3mb1tNTzOoIi4C5iOIHa6GBbWBOW3E8RaeJGVgGbmSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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