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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8648145ffae17682f510d47b184322ae976a1ead961a0f1881fae3a39eb1927c' 
  AND token = '8hUoz6EY3q2geeCdBQNOK5TzO+LxGKVVA3KLaAhYBMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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