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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f599ae378cde20c30b882e4e5ce199aa50fee1a5b7b54594fd79ca766ff49af9' 
  AND token = 'dlWTZ9Rwcqv8MSozqFYFa7a+SyroPp694nNXRm5J3x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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