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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda16164202496d63a7b9e4c863e78a3d474b06c2b3c972ee1759bb111f97f03' 
  AND token = 'zZ17lZg15pPjb6PSn039li/90hMXzDIzBsg1QxK5ALA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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