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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e835af5f5607afa7b21e171bb7ae589010f8dad5cdf0983ec0686e3d3f3df472' 
  AND token = 'rfaPUnl3N7XzlyP4auKTuz5MORg7Y30iPavbKgWG5xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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