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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026d144e362d231a7ca3f6ff30b5c9e6e54f74dfe4a127a5c972d5ddc48d2cd2' 
  AND token = 'A/c50UGIaJxh6k1mHQ0KhGBQ1dWSvRfluFsMzjQVSrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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