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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13fc5f81ac592ad00dc687e8ebf7f830907ccdd1fd116ff9d8e32e4d3a2a8f3' 
  AND token = 'QmymFKNxiS0ifLi3O0sjXn+h2nwLGWxQ/ET+YEeG/vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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