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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae21047cb225eb7ccea067c71c6ba91db84b2a40b46614624ba13005e9c1add4' 
  AND token = '/jfDcrBvvRTBgPe9uLK+vwHGCI5n/nA49U4XRtGuVOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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