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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a4529f2fe31413479b9e763bfb2372f212bf2ff287d84c4769e440cd0bfae9' 
  AND token = 'g9DJckrbIv4O69osIKK+6WoqeBKD4D/m3HX1zfdsXsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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