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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ce357c6b8f0c516cdc5a234b608c19eb3f68dd536ba7457553fd836983c08d' 
  AND token = 'vvUvISAqwXrnxNfGcPtLYZXmOgv6NHc6xte00XQ+gOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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