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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad2b15e9ca864f1d5709cfe2e560af0c70fa82cbb493766784ec84d51ea8498' 
  AND token = 'b54NbmvuuNhYp2ezpeXxwQoUEmAQfLyeZYG/ZDpi1So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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