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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c155760127b2b0958b9c1d769ddf8addf9468bf8878c8dbfa8fb217abc597316' 
  AND token = 'cGxIdiuwCN7Iu8usLeb1wA6n7UTK+t9Gajfy+Wdx3Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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