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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d331d4875275119177c9097a67ae2cf4204031d7abec2657705b814815aab49' 
  AND token = 'E8bMXBZ7aeXz6JKNUl6gvLagTNEs3mgCFf7/sAelqU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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