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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce328f1938cb0fbbd097dc4dd0ee7af47fd2d9f3d92f01ac405a02aef8dc8e8' 
  AND token = '8BtsV+8Dbywff6B2slL1UgTDpmXA/p5AFLN15T+f36o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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