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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4ab8d39b2a244aa4ec40646a2e4761e011aeb2b16593da3a01ee3c21d92cd8' 
  AND token = 'XBRAv+1qC1TnrkfhBQcwB7rcw53Im4smYPGlmg+WC7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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