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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50dac22c54e3a2befe6e7ec190aa85d5e14360199cbf0a1e165ac285f1fd26c0' 
  AND token = 'KnxobbZ6NPnG1zSHnaxy5SO/Oeyoncp5t2/I4py5Rtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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