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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07e354c5f117e9a5763bdd5ee8e6498967446fd1831cadb534fe7e2cdd21748' 
  AND token = '1zVCGc6pNVdeUmmpGzcRTDRdnd6/wE333seUYT6CCoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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