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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5398a452323c4afb0191322f2d835faae87176a7778616feb79531dcbc56f462' 
  AND token = 'fl5AyLXE7yVK+d2Qc6SC1dGZ4dImibGu/3/J2VYCZYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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