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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb163663255588a9b038e56761a2289d6fc52016b3f1a0bc98f2cc48f1b3aba' 
  AND token = '9hEjVNEERFNM14DSzWyBLpet60wrUb6Nzwz2hv4iHig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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