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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9ab7fdf0a86d6e4e8da52c9942971844acb48a42427286121a33645b9442b9' 
  AND token = 'oSlsddgsoSYALRolJzeJEGEYDWXaQsWP8WodLx4BwIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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