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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1f963bb59cf08e2271b7b3f9fff19a4f8a517f4e6ca2d12c761d2de8a0458e' 
  AND token = '1++I9QoOyLEhuIuopZd31TUdUwZAfyut1vVrk3MulfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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