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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b5c542d740cecf9618864bd93cdd4349d2f37f83fc8df4cd605c97a3ac587e' 
  AND token = '4zV9l3JsvtLTYVmoI1exNxrjv9FIqL8uwYbRBRE45m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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