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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc63e101e7d9f8b56d31d963cf17c3f3670c8ccff7b34716b4f608f36d7784fc' 
  AND token = 'j0uCcLYzWDHnieBLaTSfBM1q4H2v8VcPdatGZT7eqdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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