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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c646a067bbd00a0141153d238a8ccbf26a9b0fd6f258583061aaac9f1919f458' 
  AND token = 'XPoSPl6197LJYvwB9jgvZP4I2LukHNgAPRob1BcIBCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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