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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef533a98bfec2804b3a2e14656c6ecdf7dd40ed20ebf570f2299c334a63473fb' 
  AND token = 'KxaC9I6n8+YzrPJcB4cIMELykVvBegNE+IkjFeO1MGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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