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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092f678c30a7a0b4693f7961fcbb548c4cd51d8df976828059975ddb270d2c8c' 
  AND token = 'sLoEhJGpyv6f1U+Hd74RJRMYOW4LkLfWLifaX6ok9VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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