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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6979b9bbaa1bec68df4fe7f7c6b9cd235c3657d7eed2c2e62c6be1d918ae9612' 
  AND token = 'uifc6dN/WtYSBG2TYRo7iyP3lr7qQ4LEszRB+fgYIxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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